BERTHOLF. These had been determined during the dedicated trials. More than 300 runs in regular waves were performed in different headings, speeds and wave heights. In irregular waves about 60 tests were done consisting of several runs in significant wave heights of between 3 m and 9 m, again with different headings and speeds. Furthermore, 10 tests in multi- directional, irregular waves were used to compare to the trial results.
Finite element models Bureau Veritas built three finite element models in 2009 and 2010; the coarse mesh model and the first and second level refined model. The coarse mesh model has around 70,000 nodes and 140,000 elements. And as part of the first level refined model, the number of elements in the amidships area was increased by a factor of four. The first level refined model comprised around 120,000 nodes and 200,000 elements. For the second level refined mesh model a further
refinement was done in the vicinity of a number of fatigue sensitive locations. Eventually, this model consisted of about 190,000 nodes and 270,000 elements.
230 days analysed In a bid to evaluate fatigue life prediction methodologies and to forecast structural maintenance needs, a 48-month monitoring campaign is being performed. The monitoring campaign got underway in early 2009 and over the course of 2010 and 2011 analysis of the data has been fully automated. At a sample rate of 200Hz, 600Gb of data is collected each month and data disks are sent to MARIN. After processing, this results in a deployment report, which includes information about the encountered environmental conditions, the adopted operational conditions and the cumulative damage per strain gauge amongst other things. Up until now, three deployments have been carried out and 230 days have been analysed.
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